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What Exhaust Size For A Efr 800Hp Setup ?

cobrAA

By cobrAA,
in Engines & Forced Induction

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Ben C34 Grand Master

Ben C34

Posted
Posted

4 inch isn't a volume. It's a diameter.

The silencing ability is determined by the mufflers, not just the pipe size. I've heard some loud 3 inch exhausts, doesn't mean they all are.

cobrAA Mentor

cobrAA

Posted
  • Author
Posted (edited)

4 inch isn't a volume. It's a diameter.

The silencing ability is determined by the mufflers, not just the pipe size. I've heard some loud 3 inch exhausts, doesn't mean they all are.

Agree, but its a lot easier to find 3 inch *quality* muffler/resonator than in 3.5 inch or 4 inch ( most are just ',race spec'' and barely do sh*t lol). Lets be honest, people who go 4 inch usually don't care too much about sound isn't ?

Edited by cobrAA
AngryRB Grand Master

AngryRB

Posted
Posted (edited)

What about having it 3.5/4inch all the way to the last muffler and having that smaller eg. 3inch/3.5inch? would that be effective seeing how its so far from the turbo or still restrictive?

Edited by AngryRB
cobrAA Mentor

cobrAA

Posted
  • Author
Posted

What about having it 3.5/4inch all the way to the last muffler and having that smaller eg. 3inch/3.5inch? would that be effective seeing how its so far from the turbo or still restrictive?

I was actually thinking about doing a 4 inch dowpipe and using a 3.5 inch cat-back.

At the dyno, I could remove my 3.5 inch cat-back and see how much i gain. this way I would need if it's worth the price of custom.

Piggaz Grand Master

Piggaz

Posted
Posted

I was actually thinking about doing a 4 inch dowpipe and using a 3.5 inch cat-back.

At the dyno, I could remove my 3.5 inch cat-back and see how much i gain. this way I would need if it's worth the price of custom.

You're going to all the effort to go to a modern single on you're setup. Give it the best chance that it can by going the biggest exhaust you can. The "small exhaust" on turbo engines has been blasted out of the water and a 3 inch on a 8374 won't do it.

4 inch with the biggest, baddest mufflers you can find. Custom made (which really won't cost you much more than a off the shelf system). Done.

cobrAA Mentor

cobrAA

Posted
  • Author
Posted

You're going to all the effort to go to a modern single on you're setup. Give it the best chance that it can by going the biggest exhaust you can. The "small exhaust" on turbo engines has been blasted out of the water and a 3 inch on a 8374 won't do it.

4 inch with the biggest, baddest mufflers you can find. Custom made (which really won't cost you much more than a off the shelf system). Done.

Gotta love forum's influence ! :)

But I have to say that Geoff when he managed to make 700whp with his efr, he had a 3.5 inch with cat. So I'm thinking 3.5 without cat shouldn't that much restrictive.. I mean.. i dont think we can really make 750whp with this turbo on a rb26.

colinhunt Enthusiast

colinhunt

Posted
Posted

Gotta love forum's influence ! :)

But I have to say that Geoff when he managed to make 700whp with his efr, he had a 3.5 inch with cat. So I'm thinking 3.5 without cat shouldn't that much restrictive.. I mean.. i dont think we can really make 750whp with this turbo on a rb26.

Seems like you already know best.

Skepticism Enthusiast

Skepticism

Posted
Posted

dyno readouts of cars with exhaust restrictions are the saddest shit ever. takes forever to spool and no power.

even if you can still hit your power goals you'd want to get the thing spooling as early as possible right?

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